Electric igniting device.



UNITED STATES PArENT oEEIoE.

EoY E. HARDY, or NEW YoEK, N. Y.

ELECTRIC IGNITING DEVICE.

Specification of Letters Patent.

Patented April 14, 1908.

Application led December 1 8, 1905. Serial No. 292,178.l

To all whom 'it may concern:

Be it known that l, Bor E; HARDY, a citi- .zen' of the United States of America, residing at New York city, in the. county o'f New York and State of New York, have invented certain new and useful Improvements in 'Electric Igniting Devices, of which the followingl is as ecication, reference being-had therein to t e accompanying drawings. i

, This invention'relates to that type of elec.

trical igniters in which an induction coil is used to -produce a jump spark for firing charges in internal combustion engines on the lnterruption of a current passed through its rlrnary or low tension circuit.

e oljectvof my invention'is to combine the induction coil and a sparking plug in a single structure in such a manner that itis ofcompactshape, durable and efficient in operation andeasy to mount and dismountv from the engine.

' To this end my invention consists in the arts' al as more ful-yhereinafter describe and shown in the accompanying drawings, in which trodes thereof.

Flgure l, is a vertical central section, and

Fi'g. 2, isa cross section on line of Fig. l.

A and B represent diagrammatically the primary. and secondary of an 'induction coil which may be of any known construction and -C represents' an outer inclosing tubular casing referahly' of insulating material in whichA e induction coil is secured.- This casing has secured to its closedv end the binding "postsjya b 'to which'the terminals of the primary circuit are secured and with which the terminals ofthe primary of the induction vcoil are electrically connected. 40 i D represents the exterlor metallic shell oi a sparkplug aniconstituting oneof the eleclt 4is provided with the usual screvv-threaded portion -c adapted to be screwed into a. correspondingly threaded opening inthe cylinder of the engine, and with an enlargedshead'd which lits into the open end of the casing and is detachably secured therein'inany'- suitable manner, as by means of small screws e thereb closing the casin at its open end. The caslng C is made -suita ly longer than the inductionooil and thereby forms an air. space -E between the s ark plug and the adjacent end of the inuction coil and this air s acecomrnunicates through openingsf forme inthe casing with the outrair.' I

peculiarconstruction, arran ement and o eratlonvof dlifer'ent 1e electrode G is wrapped lengthwise with i sheet-mica held in place o n op vosite sides of the plug F by thin mica disks and ,Z Which aretightlyclamped together4 with a clamping nut m and the locknut 'n placed upon the screw-threaded end of the electrode, a Washer c beingplaccd below the nut. vThe electrode Gr is electrically connected with one terminal of the secondary ofthe induction coil and theA metallic shell of the spark plug is electrically connected with the other. -terminal. by the binding screwp.

. Myconstruction is simple 'and compact and I 'gain the advantage of having4 the secondary Circuit wholly internal Without the 'least danger of injuriouslyfl aiecting the msulation of the induction'coil by heat commum- V cated fromv thespark plug or engine head,

since it is protected b the intervening ventllated air space Whic extends u into the `mantle and down intoV the spark p ug, while the casing itselt` is a poor conductor of heat;

the'coil may he further protected by se arati ing the coil from the air space by a Wa H of like material and the mantle may be len th.

ro vided with ventilating'holes for its vv ole;-

.avin thus 'fully described; my invention, I

1: In an electric igniting device the combination of an inductlon coll, a casing ofnon-v Conducting material inclosing said coil'and projecting at-one end beyond the same, exterior binding screws 'carried by the casing in electrical connection with the terminals of the 'primary of the coil, a sparking plug having an exterior metallic shell forming one electrode, a secondvelectrode insulated there-l in, a iianged head. integral Withthe shell detachabl 'engaging and closing' the projecting end of t e casing and forming an air s ace between it and the induction coil, and e ectrical connectons'connecting the exterior shell-,and

theinsulated electrode with the terminals of the secondary Within the air space 1n the cas- 11i-an elearic'ignaingdevi,the combi.

nation of an induction coil, Va perforated, tu bular casing of non-conducting material in closing the same and projecting at one end beyond the same, a sparking plug having one electrode in the form of an exterior metallic shell secured inthe projecting end of the'casing,`and an insulated Inetalllc conductor secured within the slicll forming the other eleotrode, the exterior shell forming an air space between'` it and tliefinduction coil and. provided with an annular recess in the adjacent end ofthe shell around the inner electrode.

3. In an electric igniting device, a tubular casing of insulating and non-conducting material closed at the outer end, 'a transverse wall ci insulating .and non-conducting material an induction coil securedin the easing between the outer end and saidl transverse Wall, bind A ing'screws on the outer end of the Casing connected to the primary terminals of the'coil, a spark plug consisting of a hollow shell pro vided at its inner end with a circular integral electrode and between it and the coil in communieation with the outer air through apertures in the casing.

In testimony W in presence of two Witnesses.

ROY E, HRDY.

Witnesses I Trios, G. LoNes'rAFF, OTTO F. BARTHEL.

iereof I aiiix rny signature 

